Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Quantos anos tem 1 corrida?
 ###Tabelas: CREATE TABLE legislative_elections (legislative_elections_id AUTO_INCREMENT PRIMARY KEY, Election INT, Total votes INT, Share of votes VARCHAR, Outcome of election VARCHAR, Election leader VARCHAR) CREATE TABLE previous_winners (previous_winners_id AUTO_INCREMENT PRIMARY KEY, Year VARCHAR, Men's singles VARCHAR, Women's singles VARCHAR, Men's doubles VARCHAR, Women's doubles VARCHAR, Mixed doubles VARCHAR) CREATE TABLE canadian_records (canadian_records_id AUTO_INCREMENT PRIMARY KEY, Event VARCHAR, Long Course/Short Course VARCHAR, Year Set INT, Time VARCHAR, Meet VARCHAR) CREATE TABLE narrowest_margin_of_runs_victory (narrowest_margin_of_runs_victory_id AUTO_INCREMENT PRIMARY KEY, Score VARCHAR, Opposition VARCHAR, Venue VARCHAR, City VARCHAR, Year INT) CREATE TABLE czech_republic (czech_republic_id AUTO_INCREMENT PRIMARY KEY, Seat INT, Series 1 VARCHAR, Series 2 VARCHAR, Series 3 VARCHAR, Series 4 VARCHAR)  
SELECT COUNT Year FROM narrowest_margin_of_runs_victory WHERE Score = 1 run